Stretch block assembly



FIG. 1 is a front elevational view of a stretch block assembly, showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof, showing the upper portion of the design in a separated condition and the lower portion in an open condition;

FIG. 6 is a rear elevational view thereof; and

FIG. 7 is a perspective view of the design with the top and bottom elements thereof in a separated condition. 

The ornamental design for a stretch block assembly, as shown and described. 